| Mary Fox, Baroness Holland | |
| Father: | John FitzPatrick |
| Relatives: | Richard FitzPatrick (brother) John FitzPatrick (brother) Louisa FitzPatrick (sister) Richard FitzPatrick (grandfather) John Leveson-Gower (grandfather) |
| Children: | Henry Vassall-Fox |
Mary Fox (née FitzPatrick; 1746–1778) 2nd Baroness Holland, was a daughter of John FitzPatrick, and wife of Stephen Fox, 2nd Baron Holland, whom she married on 20 April 1766. They had one son, the notable Henry Vassall-Fox, 3rd Baron Holland born at Winterslow House, Wiltshire, on 21 November 1773.
She was the sister of John FitzPatrick, 2nd Earl of Upper Ossory; the Hon. General Richard FitzPatrick, Chief Secretary for Ireland (who also served twice as Secretary at War), and Louisa FitzPatrick Petty, 1st Marchioness of Lansdowne.